Summary Report for Conduct of Kozloduy NPP Stress Tests

“Kozloduy NPP” PLC
SUMMARY REPORT
for Conduct of Kozloduy NPP
Stress Tests
3.2.4.1.1 Potential impacts at flooding of the lowland at break of the dike in the area between
hot channel-2 and BPS
At break of the national dike first shaft pump stations located in the immediate vicinity of
the national dike will be flooded and hindered as sources of supplemental water for spray pools of
Units 5 and 6. Access to the bank pump station by land is most likely to be lost. This will happen
during the first hours following the break of the state dike because the drain channels and roads to
the bank pump station are at lower elevation and will be quickly flooded. At flooding of the lowland
and filling to elevation 32.00 meters also destruction of part of the columns of power lines on the
way of the tidal wave can be anticipated.
The emergency pipelines of the emergency pump station of bank pump station to the
emergency capacity are steel and placed in the pit, but when crossing the drain channels are open
and bridging them. These open areas are vulnerable and can be damaged by tidal wave.
In the valley formed by the hot channel-2, cold channel-1 and the Danube embankment all
the sewage from the site of Units 1 to 4 and from the reactor compartment, diesel generator stations
and the Turbine Hall of the site of Units 5 and 6 are drained. The rest of the sewage of the site of
Units 5 and 6 will also retain water because water will pass over the siphons of low pressure
channels and under hot channel-2 in outfalls for sewage and rain water. This can create conditions
of water return by sewage collectors for domestic and rain water sewers, passing by spray pools and
filling to the elevation of plain flooding. It is possible for sewage pits the site to be filled with water
to el. 32,93 m. The availability of treatment plant for domestic waters for the site of Units 5 and 6
does not prevent the entry of water in domestic sewage system as it is possible that water passes
through shaft 537, which serves as an overflow at excess capacity of the treatment plant.
In the town of Kozloduy the vicinity of the mill and a part of Lom highway will be flooded.
The access from the town of Kozloduy to the site will be possible in the ring highway and pass
point Kharlets. To the west the water will reach the town part to the north of hotel “Istar”, will flood
the buildings of ECR, the treatment plant, settlements.
3.2.4.1.2 Potential impacts at flooding of the lowland at break of the dike in the area between
the town of Kozloduy and hot channel-2
At flooding of the valley of this area the end result will be almost the same as described in
item 3.2.4.1.1. The difference will be that only part of the columns will take the initial impact of the
tidal wave as the others are protected by hot channel-2.
3.2.4.1.3 Potential impacts at flooding of the valley at break of the dike in the zone between
BPS and Ogosta River
In flooding of the valley from this area power lines Harlets, Neutron and Danube will be
affected the most. In the area there are no other facilities related to the operation of Kozloduy NPP
besides the open stores. Under certain conditions the formation of the initial tidal wave the dike of
warm-channel-1 may be eroded and destroyed. Ingress of water to the area of the valley between
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